package month1;

public class MergeTwoSortedLists21_04 {
    public static void main(String[] args) {
        ListNode l1 = new ListNode(new int[]{1, 2, 4}), l2 = new ListNode(new int[]{1, 3, 4});
        System.out.println(mergeTwoLists(l1, l2));
    }

    static ListNode mergeTwoLists(ListNode list1, ListNode list2) {
        if (list1 == null) {
            return list2;
        }
        if (list2 == null) {
            return list1;
        }
        if (list1.val < list2.val) {
            list1.next = mergeTwoLists(list1.next, list2);
            return list1;
        }
        list2.next = mergeTwoLists(list1, list2.next);
        return list2;
    }
}
